Holder for rotary tools with center holes of different sizes



Feb. 14, 1950 V w. J. T. HALL 2,497,217

HOLDER FOR ROTARY TOOLS WITH CENTER HOLES OF DIFFERENT ES Filed Mar INVEN TOR.

Patented Feb. 14, i 1950 UNITED -S ()FrF'l C E THOLDERE'FORTERQ'PARY -VVZITHLCEN- TTERIHOLES 0F DIEEFlRE'NiTFSI'ZES ATClaims. -1 :My inventi'onz'relates toxaa ishaft or splndle .fer holding rotary tool attachmentsesucheasegrindi-wheels, .zsaws, milling cutters, miner-brushes,

Pbufiing wheels :and the 1ike,-'-and1has reference rmorefparti'cularlyxto faciiitiesswherehy the shaft :or .spindle is adapted 'to accommodate such stachments with reenter holes aof different sizes.

;iAttachmentszifthetcharacterabove-mentioned, which'fare "commonly rused with :powertoperated (devices, such 55S high: speed 1dril1s,.::have -center holes by which "they 'are zattacha'hle :ini centered position *on f the spindle or shaft by which :they are "operated.

Such attachments, rhowever, rare made avith reenter holes "of :tdifierentasizesrtofit :on :shafts t "or spindles :o'f ."the :differentasizes -with which 'the power: operated devices orrhighspeedadrills .on n rhich they are usable are :equipped aor adapted to"accommodaterandit toftentimes :happens'zthat =such attachments'arezavailable'withzcenter:holes --'o'f'a size which will not fit 'ondzhe shaitrorzspindle w:il*l;he *particular zpower "operated :device which i-isavailable for use.

Accordingly, it 1 is :desirabie ,s-to provide :such

power operated deviceszwithsasshaft zorrspindle which is adapted-*to: accommodate-such attachments 1 with center :holes 'of iseveral differentvsizes.

"The principal objects 'of .mycinvention zareto mrovide :a mounting 'forfirotary1tool -zattachments er the type abovezmentioned .Whi0h is adapted "to accommodate: attachments with center holes "of: several: iiifierentsizes ;:to construct-the; mount fling in a form .for detachable application dmthe chuck of aihighspeed drill-or thelike; to construct tthe facilities 'which accommodate center $110165 of tdifierent sizes as :a unitary part -;of :the shaft (DIPSPiIIdl'B 'ofzthe holder; 'and :in general to prowiden simpleand .convenientxholder: of :th-is'nhar- :a'cter hy which :rotary tool iattachments :of the typesabove-imentioned: are accuratelyandsecurely held :in rproperly :centered "position, ttheseiand rather aobjects being .aaccomplished :as pointed out more fully hereinafter .cand 'i-as :shown aim :the

1 a thinattachmentsuh asa circular-'saw,:mounted on theholder;

Fig. -7 is -a View similar to 'Fig." Sibut showing .a :wheel with small :oenter hole mounted. on xmy attachment; sand ,Eig. 8; is-radiametr1cal sectional viewiofamo'di- .ficationof (the -.clamping plate of Fig. 3.

Attachments of the tyre. for which'the present invention. is (designed, namely, grinding wheels, circular saws, milling cutters, wire brushes, 1 but.- fing wheels andfthe like, areused very extensively with high speed edrills and the like which have a chuckein which a tool is vdetachaloly secured ,for operation by the drill, and my .invention ;-is illustrated in :a form adapted for detachable application in :such cchucks cal-though inotinecessarily limited thereto.

.Asshownon the drawing, ltheiholder comprises raespindle or stem,.illustratedasa whole in Figs-1, having-1a ;plain relatively long portion .10 :at =.0ne end, "which adaptedito be? engaged in the 'chuek of-Ea high speed drill :or the like, and .-having-.z-at the other end: arelatively short threaded portion 11 iuponavhich; a grinding wheel, circular-saw ='or other attachment. or'tool is secured =for; operation by .ithe night-speed- :drill, .said:s pindle or stem being forirred =between1the portions 10 .and -14 witheamircular-:.disk portion I-2 serving.,-as--a fixed joclampingaplatei-against which .the grinding wheel,

.holderhaisidesignedsior ..use with the ..usual high sp'eedQdrill.

Moreover, the stem .portion .lflhf. holders idesignedifor :such use. is also "preferably or onenuartereinch ;diameter,.; as this is .a .size M of stem awhich will;beireadiliea'ccommodated in thechucks \ofimostihighspeed .drills with which attachments if ;the characterrcontemplated .herein :are genrerallyiused.

L'Iozadapiesuchzhdlder ztozaccommodatej grinding wheels, circular isaws rand rsimilare. attachments sh'aving ccenter ropenings f:;of :larger size than the dzhreadedrstem nortionrlzIg foraexample;withmenter openings of one-half inch diameter, .athe l-iac'e tplateiflisrofistepped formihaving at thesthrea'decl stem aside iarcircular .ofiset oraextension .116 "eoncentric with'ithesaxis tofithe astem portion H rand fofitone halfzinchi:diameterzandt'preferablyfofisuflim mientmidthlcfor example, oneeeighth winch width,

to afford substantial engagement in the opening of a grinding wheel or the like that is mounted thereon.

Moreover, for cooperation with this shoulder portion or step IS a clamping ring I! is also provided with center opening l8 of the same diameter as the shoulder is so as to fit freely but accurately thereon, and this ring I! which is preferably of the same size as the clamping plate I2 is of the same thickness as the width of the shoulder l6 so that when said ring I! is located on the shoulder 16 the outer face of said ring l'l iissiiush with the outer face of the shoulder portion In using the above described holder for attachments having center holes of the same size as the threaded stem ii, the clamping ring I1 is first placed in position on the shoulder 16 as shown in Fig. 7 after which the attachment, indicated at is in said figure is slipped on the stem portion H with the washer L; applied on the stem portion H at the outer side of the attachment and the parts clamped together by threading the nut I4 onto the threaded stem H, a lock nut 28 being preferably interposed between the nut 14 and the clamping plate It. Thus, the attachment is clamped firmly in place against the outer faces of the shoulder I6 and the clamp plate I! thereon.

When, however, attachments, such as shown at 2| in Fig. or at 22 in Fig. 6, are employed having half inch center holes as indicated at 23 and 24 respectively, the clamping ring I! is removed from the shoulder i5 and the attachment is mounted directly on the half inch diameter shoulder It, which thus centers the attachment on the holder, and it is clamped in place therein.

If the attachment is a grinding wheel or other attachment, such as shown at 2! in Fig. 5, having a thickness greater than the width of the shoulder l6, then the clamping ring ii is not employed but the clamping plate 13 is merely secured directly against the outer side of the attachment 2! by the clamping nut It and lock washer 2!} as shown in Fig. 5.

If, however, an attachment of a thickness less than the width of the shoulder It is employed,

, as for example the circular saw 22 of Fig. 6,

then the clamping ring i? is first inserted in place on the shoulder 16 against the outer face of the attachment 22, and the clamping plate I3 is then applied on the stem H and clamped, by the nut l4 and lock washer 243 against the'outer face of the clamping ring H as shown in Fig. 6.

' Thus, the holder above described is adapted to accommodate grinding wheels, circular saws.

and other attachments having either of two diffeijgent sizes of center holes and irrespective of the thickness of such attachments.

If an attachment with one-half inch center hole to be mounted on the holder is of the same thickness as the width of the shoulder I 6 and the clamping plate 83 will not draw up sufficiently tightly thereagainst to hold it securely against turning on the holder, then the clamping ring I! may be employed, care being taken, however, to hold the clamping ring I! accurately concentric with the clamping plate is in tightening the nut 14 so that the holder and attachment will not be off balance.

For such close fitting cases,.:however, the clamping plate [3 may be made, if desired, as shown at 25 in Fig. 8 with a slight circular recess 26 of shallow depth, for example, one-sixteenth of an inch in the case of a holder of the particular size above indicated, this recess 26 being concentric with the center hole 21 and of suitable diameter to receive therein the outer end of the shoulder l6.

Thus, when an attachment with half inch center hole is employed and of a thickness the same as or a trifle less than the width of the shoulder It, the clamping plate 25 will telescope on the outer end of the shoulder is sufficiently to insure a tight clamping of the attachment between the clamping plates 12 and 25.

While I have shown and described my invention in a preferred form, I am aware that modifications can be made therein without departing from the spirit of the invention, the scope of which is to be determined by the appended claims.

What is claimed is:

1. A tool holder of the class described, o0m prising a spindle having at one end thereof and integral therewith, a two place mounting for optional attachment thereto of disk type tools with large or small center holes, said two place mounting comprising a stepped face plate having a threaded stem of the small center hole size projecting centrally from the stepped side of the face plate at the opposite side thereof from and in axial alignment with the spindle, said face plate having a projecting portion thereof forming an annular step of the large center hole size and having the threaded stem projecting therebeyond at the center thereof, a clamping plate of a thickness at least as-great as the width of said annular step and having a center hole which fits on the annular step, another clamping plate of a diameter greater than that of the annular step and having a center hole which fits on the threaded stem, and threaded means on said threaded stem and by which said clamping plates are secured respectively on the annular shoulder and on the threaded stem.

2. A'tool holder of the class described, comprising a spindle having at one end thereof and integral therewith, a two place mounting for optional attachment thereto of disk type tools with large or small center holes, said two place mounting comprising a stepped face plate having a threaded stem of the small center hole size projecting centrally from the stepped side of the face plate at the opposite side thereof from and in axial alignment with the spindle, said face plate having a projecting portion thereof forming an annular step of the large center hole size and having the threaded stem projecting therebeyond at the center thereof, a clamping plate of the same thickness as the width of said annular step and having a center hole which fits on the annular step, another clamping plate of a diameter greater than that of the annular step and having a center hole which fits on the threaded stem and threaded means on the threaded stem and by which said clamping plates are secured respectively on the annular shoulder and on the threaded stem.

3. A tool holder of the class described, comprising a spindle having at one end thereof and integral therewith, a two place mounting for optional attachment thereto of disk type tools with large or small center holes, said two place mounting comprising a stepped face plate having a threaded stem of the small center hole size projecting centrally from the stepped side of the face plate at the opposite side thereof from and in axial alignment with the spindle, said face plate having a projecting portion thereof forming an annular step of the large center hole size and having the threaded stem projecting therebeyond at the center thereof, a clamping plate of a thickness at least as great as the width of said annular step and having a center hole which fits on the annular step, another clamping plate of a diameter greater than that of the annular step and having a center hole which fits on the threaded stem, and a nut on said threaded stem and by which said clamping plates are secured respectively on the annular shoulder and on the threaded stem.

4. A tool holder of the class described, comprising a spindle having at one end thereof and integral therewith, a two place mounting for optional attachment thereto of disk type tools with large or small center holes, said two place mounting comprising a stepped face plate having a threaded stem of the small center hole size projecting centrally from the stepped side of the face plate at the opposite side thereof from and in axial alignment with the spindle, said face plate having a projecting portion thereof forming an annular step of the large center hole size and having the threaded stem projecting therebeyond at the center thereof, a clamping plate of a thickness at least as great as the width of said annular step and having a center hole which fits on the annular step, another clamping plate of a diameter greater than that of the annular step and having a center hole which fits on the threaded stem, threaded means threaded on said stem and securing said clamping plates respectively on the annular shoulder and on the threaded stem, and a center holed tool on the two place mounting and clamped between the face plate and the second mentioned clamping plate.

WALTER J. T. HALL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

